diff --git a/crates/wright-driver/src/config.rs b/crates/wright-driver/src/config.rs
index 33d6554..f620666 100644
--- a/crates/wright-driver/src/config.rs
+++ b/crates/wright-driver/src/config.rs
@@ -125,9 +125,10 @@ pub struct SessionConfig {
     /// [`CompilerSession::language_provider`] spawns a provider client for a
     /// language id from this registry; when no provider is configured the
     /// refusal is explicit and there is no fallback to in-process frontends.
-    /// The registry is empty by default; `wright_lpp::ProviderRegistry`
-    /// documents the configuration (and the `LPP_MOCK_PROVIDER` env hook
-    /// used by tests and CI).
+    /// The registry is empty by default; providers are registered explicitly
+    /// through `wright_lpp::ProviderRegistry` (integration tests and CI
+    /// locate the mock provider through the `LPP_MOCK_PROVIDER`
+    /// environment variable).
     pub providers: wright_lpp::ProviderRegistry,
 }
 
diff --git a/crates/wright-lpp/src/registry.rs b/crates/wright-lpp/src/registry.rs
index be8b22c..ad6d06d 100644
--- a/crates/wright-lpp/src/registry.rs
+++ b/crates/wright-lpp/src/registry.rs
@@ -15,10 +15,6 @@ use std::time::Duration;
 use crate::error::ProviderError;
 use crate::provider::StdioLanguageProvider;
 
-/// The environment variable naming the LPP mock/conformance provider binary
-/// used by integration tests and CI.
-pub const LPP_MOCK_PROVIDER_ENV: &str = "LPP_MOCK_PROVIDER";
-
 /// One configured provider, keyed by its opaque language id.
 #[derive(Debug, Clone)]
 pub struct ProviderConfig {
@@ -47,12 +43,6 @@ impl ProviderConfig {
             request_timeout: Duration::from_secs(30),
         }
     }
-
-    /// Set an explicit per-request timeout.
-    pub fn with_request_timeout(mut self, request_timeout: Duration) -> ProviderConfig {
-        self.request_timeout = request_timeout;
-        self
-    }
 }
 
 /// A registry error.
@@ -99,16 +89,6 @@ impl ProviderRegistry {
         Ok(())
     }
 
-    /// The configuration registered for a language id, if any.
-    pub fn get(&self, language_id: &str) -> Option<&ProviderConfig> {
-        self.providers.get(language_id)
-    }
-
-    /// Every registered language id, in deterministic order.
-    pub fn languages(&self) -> impl Iterator<Item = &str> {
-        self.providers.keys().map(String::as_str)
-    }
-
     /// Spawn a fresh provider session for `language_id`.
     ///
     /// Refuses explicitly when no provider is configured for the id
@@ -123,22 +103,4 @@ impl ProviderRegistry {
                 })?;
         StdioLanguageProvider::spawn(&config.command, &config.args, config.request_timeout)
     }
-
-    /// A registry populated from the environment: `LPP_MOCK_PROVIDER` names
-    /// a mock/conformance provider binary serving the reference language
-    /// `x-demo-lang`. This is the integration-test/CI hook; production
-    /// configuration registers providers explicitly.
-    pub fn from_env() -> ProviderRegistry {
-        let mut registry = ProviderRegistry::new();
-        if let Ok(command) = std::env::var(LPP_MOCK_PROVIDER_ENV) {
-            if !command.is_empty() {
-                let _ = registry.register(ProviderConfig::new(
-                    "x-demo-lang",
-                    PathBuf::from(command),
-                    Vec::new(),
-                ));
-            }
-        }
-        registry
-    }
 }
diff --git a/crates/wright-lpp/tests/mock_provider.rs b/crates/wright-lpp/tests/mock_provider.rs
index ee30ae9..a271c94 100644
--- a/crates/wright-lpp/tests/mock_provider.rs
+++ b/crates/wright-lpp/tests/mock_provider.rs
@@ -170,10 +170,6 @@ fn registry_lookup_is_by_opaque_language_id() {
             language_id: "x-other-lang".to_string(),
         }
     );
-    assert_eq!(
-        registry.languages().collect::<Vec<_>>(),
-        vec![DEMO_LANGUAGE_ID]
-    );
 }
 
 // ---------------------------------------------------------------------------
@@ -506,14 +502,11 @@ fn missing_capability_is_an_explicit_refusal_not_a_fallback() {
     };
     let mut registry = ProviderRegistry::new();
     registry
-        .register(
-            ProviderConfig::new(
-                DEMO_LANGUAGE_ID,
-                path,
-                vec!["--without".to_string(), "compile".to_string()],
-            )
-            .with_request_timeout(std::time::Duration::from_secs(30)),
-        )
+        .register(ProviderConfig::new(
+            DEMO_LANGUAGE_ID,
+            path,
+            vec!["--without".to_string(), "compile".to_string()],
+        ))
         .expect("registered");
     let mut provider = registry.spawn(DEMO_LANGUAGE_ID).expect("spawns");
     let result = provider